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Attribute Properties <ul><li>lazy </li><ul><li>Only populate attribute when queried </li></ul><li>trigger </li><ul><li>Subroutine called after the attribute is set </li></ul><li>isa </li><ul><li>Set the type of an attribute </li></ul><li>Many more </li></ul>

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PSGI/Plack <ul><li>“ PSGI is an interface between Perl web applications and web servers, and Plack is a Perl module and toolkit that contains PSGI middleware, helpers and adapters to web servers.” </li><ul><li>http://plackperl.org/ </li></ul></ul>

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PSGI/Plack <ul><li>PSGI is a specification (based on Python's WSGI)